
California HVAC Services
Local HVAC expertise is vital in California, from Esperanza Farms to Southwood, and throughout the community. California’s proximity to the Chesapeake Bay makes high humidity levels a factor, even by Maryland standards. Intense humidity often leads to a need to balance temperature control with indoor air quality. Our factory-trained NATE-certified technicians have the in-depth knowledge necessary to provide well-rounded HVAC solutions.
Great Mills Heating & Air Conditioning has spent over 50 years serving homeowners. Our work is backed up by a warranty, and we offer financing and payment plans through our office.
Call (301) 381-2679 or contact us online today for a free estimate.
Comprehensive HVAC Services for Year-Round Comfort
Changing seasons bring unique challenges for maintaining a comfortable and healthy indoor environment. From the thick heat of summer to the damp chill of winter, each season calls for an adaptable and well-maintained HVAC system. To address these challenges effectively, we offer a full range of heating, air conditioning, and indoor air quality solutions designed to keep your home comfortable and your systems running efficiently.
Air Conditioning That Stands Up to Summer Heat
Summers can be relentless, making a high-functioning air conditioning system imperative. High temperatures combined with coastal humidity can increase the burden on traditional cooling systems, making them less efficient. We install, maintain, and repair air conditioning systems, whether they’re traditional central air units or ductless mini-split systems.
We understand that heat alone can be unpleasant, but the added complications of excess humidity can turn your home into an uncomfortable environment. That’s why we place extra emphasis on optimizing the dehumidification capabilities of every cooling system. By maintaining proper indoor humidity levels, your air conditioning system works more efficiently, and you enjoy a healthier, more comfortable living space.
Heating That Keeps You Warm During Winter
We provide a variety of heating solutions, including furnace repairs, heat pump installations, and routine maintenance services, all customized to fit your unique needs. If your heating system struggles to handle the cold, our technicians can identify issues and recommend upgrades or repairs to optimize efficiency and performance. Modern heating systems are not only better at keeping you warm but also designed to reduce energy consumption, hopefully saving you money on your utility bills.
For those seeking an extra layer of comfort, zoned heating systems can be a great choice. These allow you to heat specific areas of your home while reducing energy use in unoccupied spaces. Whether it’s preparing for an unexpectedly colder-than-usual winter or keeping your current system running at peak efficiency, our experienced team has you covered.
Better Indoor Air Quality for Healthier Living
The quality of your indoor air matters as much as the temperature. Coastal humidity, combined with seasonal pollen and dust, can exacerbate allergies, respiratory issues, and your overall discomfort. Our indoor air quality solutions combat these challenges by addressing the root causes. From high-performance air purifiers that capture allergens to dehumidifiers that help control moisture levels, we offer solutions to make your home a healthier environment.
Additionally, we offer whole-home ventilation solutions to improve your airflow and maintain a consistent balance of fresh air. Whether installing an energy recovery ventilator (ERV) or fine-tuning your HVAC system to distribute clean air throughout the house, our approach enables comfort and health to go hand in hand.
Year-Round HVAC Solutions
When it comes to your home’s heating, cooling, and indoor air quality, the right solutions go beyond providing comfort. As a family-owned business, we’re local homeowners ourselves, and we know the importance of creating a space where you can truly breathe easier, no matter the season or weather conditions. Our skilled California team is here to provide solutions designed to meet your home’s specific needs.
Call (301) 381-2679 today. We offer 24/7 emergency service and strive to schedule all service requests on the same day you call.

Hear From Our Happy Customers
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“I have used them for my rentals, and referred them for business clients. The customer service on the phone is always helpful, and they go over & above for customers.”Lynda
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“Professional and didn't try to make me feel like more was needed than just a repair. I'm happy to have found an honest company finally!!”Gail
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“We've been doing business with Great Mills HVAC for over 15 years, and their service is always quick, professional, and friendly.”Bill
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“Great Mills HVAC was quick to respond to my emergency call for repair. The problem was quickly discovered and solved on site.”Shirley
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“We have been doing business with Great Mills Heating & A.C. since we built our house in 1997. They are professional, polite, courteous, and reasonably priced.”Ted
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“GM definitely earned a 5-star rating and not just for the last job but for all the many jobs they've done for me in the past 25 years.”Ray
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“Great Mills Heating and Air just installed my hot water heater and installed my HVAC system 4 years ago. I have been impressed with them both times.”Kathryn
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“The service team was fast, professional, and punctual. I needed a quick adjustment within a couple of weeks and they sent a tech out, same-day, without any resistance.”Adam
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“Been using Great Mills Heating and Air for over 25 years. They provide excellent service. Employees are professional, knowledgeable, and friendly.”Barbara
